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Q1. | How many roots with positive real parts do the equation s^{3} + s^{2} - s + 1 = 0 have? |

A. | Zero [Wrong Answer] |

B. | One [Wrong Answer] |

C. | Two [Correct Answer] |

D. | Three [Wrong Answer] |

View Answer
Explanation:-
Answer : CDiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ Consider the following statements

- An iron cored choke is non linear and passive device.
- A carbon resistor kept in sunlight is a time invariant and passive device.
- A dry cell is a time varying and active device.
- An air capacitor is time invariant and passive device.

1, 2, 3 and 4 are correct

1, 2, 3 are correct

1, 2, 4 are correct

2 and 4 are correct

⇒ If a signal band limited for

*f*is sampled at a rate less than 2

_{m}*f*the reconstructed signal will be

_{m}smaller in amplitude

distorted

having higher frequencies suppressed

none of the above

⇒ For any transfer function, the constant phase angle loci are

a family of circles

a family of straight lines

either (a) or (b)

neither (a) nor (b)

⇒ The electromagnets of an induction wattmeter

are laminated

are not laminated

may be laminated

must not be laminated

⇒ In equally tampered scale, frequency of each tone equals the frequency of lower adjacent tone multiplied by

(2)

^{1/7}

(2)

^{1/12}

(2)

^{1/6}

(2)

^{1/5}

⇒ In a semiconductor avalanche breakdown occurs when

reverse bias exceeds the limiting value

forward bias exceeds the limiting value

forward current exceeds the limiting value

potential barrier is reduced to zero

⇒

Match the following:

List I | List II | ||
---|---|---|---|

A. | Former | 1. | Produces deflecting torque |

B. | Coil | 2. | Provides base for coil |

C. | Core | 3. | Makes the magnetic field radial |

D. | Spring | 4. | Provides controlling torque |

A-1, B-2, C-3, D-4

A-2, B-1, C-3, D-4

A-1, B-2, C-4, D-3

A-2, B-1, C-4, D-3

⇒ The number of digit 1 present in the binary representation of 3 x 512 + 7 x 64 + 5 x 8 + 3 is

8

9

10

12

⇒ An AM wave is given by

*s*(

*t*)

_{AM}= 20 (1 + 0.5 cos 10

^{3}

*t*+ 0.3 cos 10

^{4}

*t*cos 10

^{6}

*t*) the modulation index of the envelope is

0.5

0.58

0.3

0.8

⇒ Which of these has lowest dielectric strength?

Dry air

Wet air

Cotton

Paper

⇒ A 3 phase semiconverter when supplying a certain load has a rectification efficiency of 0.6 and transformer utilisation factor of 0.35. When a 3 phase full converter is supplying the same load

rectification efficiency will be more than 0.6 and TUF will be more than 0.35

rectification efficiency will be more than 0.6 but TUF will be less than 0.35

rectification efficiency will be less than 0.6 and TUF will be less than 0.35

rectification efficiency will be less than 0.6 but TUF will be more than 0.35

⇒ A capacitor behave to d.c. as

short-circuit

an open-circuit

it behaves to a.c.

none of these.

⇒ The voltage applied to an R-L circuit at

*t*= 0 when switch is closed is 100 cos (100

*t*+ 30°). The circuit resistance is 80 Ω and inductance is 0.6 H (in which initial current is zero). What is the maximum amplitude of current flowing through the circuit?

0.0416666666666667

0.0833333333333333

0.208333333333333

0.416666666666667

⇒ Two voltmeters 0-250 V each having resistances of 5 kΩ and 10 kΩ respectively and are connected in series. To ensure that neither of them goes beyond scale the total voltage which can be applied should be less than

500 V

400 V

375 V

250 V

⇒ In a radio receiver with simple AGC

the highest AGC voltage is produced between stations

an increase in signal strength produces more AGC

the audio stage gain is normally controlled by AGC

the faster the time constant of AGC, more accurate the output

⇒ A noise can be represented as superposition of spectral components. When this noise is passed through a narrow band filter, the output of filter should look like

sinusoidal

rectangular

triangular

none of the above

⇒ In amplitude modulation, the magnitude of side bands is

*ma*/2 times the carrier amplitude, E

_{c}

*ma*times the carrier amplitude, E

_{c}

2

*ma*times the carrier amplitude, E

_{c}

4

*ma*times the carrier amplitude, E

_{c}

⇒ PAM stands for

Pulse Analogue Modulation

Phase Analogue Modulation

Pulse Amplitude Modulation

Phase Amplitude Modulation

⇒ Four voltmeters have following specifications. If accuracy is main consideration which is the best?

100 V, 2 mA

100 V, 100 mA

100 V, 1 mA

100 V, 0.1 mA

⇒ A message signal

*x*(

*t*) is amplitude modulated with carrier

*c*(

*t2ω*

3ω

1ω

0.5ω

3ω

1ω

0.5ω

⇒ In an op-amp a virtual ground is a ground for

voltage only

current only

both voltage and current

neither voltage nor current

⇒ If

⇒ The drift velocity of electrons and holes is proportional to electric field strength.

TRUE

FALSE

⇒ A telephone channel requires a bandwidth of about

1 kHz

3 kHz

10 kHz

50 kHz

⇒ Two coils having equal resistance but different inductances are connected in series. The time constant of the series combination is

average of the time constants of individual coils

sum of the time constants of the individual coils

geometric mean of the time constants of individual coils

product of the time constants of the individual coils

⇒ In a JK flip flop output Q

X and 0

X and 1

0 and X

1 and X

⇒ In figure, V

⇒ In the analogy between electric and magnetic circuits, flux is analogous to

current

voltage

rate of charge of current

rate of charge of voltage

⇒ Ground wave can be used for communication upto

5 kHz

12 kHz

16 kHz

25 kHz

⇒ In an n-type silicon crystal at room temperature, which of the following can have a concentration of 4 x 10

Silicon atoms

Holes

Dopant atoms

Valence electrons

⇒ In an op-amp a virtual ground is a ground for

voltage only

current only

both voltage and current

neither voltage nor current

⇒ If

*t*and_{on}*t*are the turn on and turn off times of a thyristor, then_{off}*t*and_{on}*t*are almost equal_{off}*t*>>_{on}*t*_{off}*t*>>_{off}*t*_{on}*t*is about twice_{on}*t*_{off}⇒ The drift velocity of electrons and holes is proportional to electric field strength.

TRUE

FALSE

⇒ A telephone channel requires a bandwidth of about

1 kHz

3 kHz

10 kHz

50 kHz

⇒ Two coils having equal resistance but different inductances are connected in series. The time constant of the series combination is

average of the time constants of individual coils

sum of the time constants of the individual coils

geometric mean of the time constants of individual coils

product of the time constants of the individual coils

⇒ In a JK flip flop output Q

*= 1 and it does not change when clock pulse is applied. The possible combination of J*_{n}*and K*_{n}_{n}is (X denotes don't care)X and 0

X and 1

0 and X

1 and X

⇒ In figure, V

_{AB6 V10 V25 V40 V}⇒ In the analogy between electric and magnetic circuits, flux is analogous to

current

voltage

rate of charge of current

rate of charge of voltage

⇒ Ground wave can be used for communication upto

5 kHz

12 kHz

16 kHz

25 kHz

⇒ In an n-type silicon crystal at room temperature, which of the following can have a concentration of 4 x 10

^{19}cm^{-3}?Silicon atoms

Holes

Dopant atoms

Valence electrons